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Question: K<sub>sp</sub> of Mg(OH)<sub>2</sub> (s) is 4 × 10<sup>–12</sup>. The number of moles of Mg<sup>2+</...

Ksp of Mg(OH)2 (s) is 4 × 10–12. The number of moles of Mg2+ ions in 1L saturated solution of Mg(OH)2 in 0.1 (M) NaOH solution is

A

4 × 10–10

B

10–4

C

2 × 10–6

D

8 × 10–6

Answer

4 × 10–10

Explanation

Solution

[OH–] = 0.1(M)

\ [Mg2+] = 4×10−1210−2\frac { 4 \times 10 ^ { - 12 } } { 10 ^ { - 2 } } = 4 × 10–10 (M)

= solubility of Mg(OH)2